scholarly journals Teachers’ misconception concerning valence and valency in chemistry

2021 ◽  
Vol 32 (4) ◽  
pp. 308-310
Author(s):  
Raghubir Singh Sindhu ◽  
Keyword(s):  
Precise Description ◽  
Science Subject

A study on the misconceptions developed or held by teachers related to the two terms valence and valency was undertaken. A total of 48 teachers (26 males and 22 females) teaching the chemistry component of science subject to 14- to 16-year-old students, in 48 schools affiliated to one district, were randomly selected for the study by taking one teacher from each school. One session was devoted for administering the questionnaire among the teachers and second session (with a gap of one day) was for addressing the teacher’s misconceptions. From the analysis of the responses, it was found that the two terms although they have the same meaning were misconceived as having different meanings. Due to this a misleading relationship between the two terms was discovered. Even the highest numerical value of valence was misconceived. The possible reasons for these misconceptions were identified. A simple, brief, and precise description of the concepts was presented to remove the misconceptions of the teachers.

UPAYA MOTIVASI DAN AKTIVITAS BELAJAR IPA PADA MATERI PENGUKURAN DENGAN MENGGUNAKAN MEDIA ANIMASI FLASH DI SMP NEGERI 3 PERCUT SEI TUAN

2013 ◽  
Vol 2 (2) ◽  
pp. 25
Author(s):  
Untung Narpati
Keyword(s):  
Learning Activity ◽  
Seventh Grade ◽  
Average Percentage ◽  
Second Stage ◽  
Satisfaction Condition ◽  
Motivation And Learning ◽  
Academic Year ◽  
Test Result ◽  
Science Subject

This research is aimed to find out the efforts to raise students’motivation and learning activity by utilizing flash animation media on the Science subject on the topic discussion of “Pengukuran” to the seventh gradestudents of SMP Negeri 3 Percut Sei Tuan. The subjects of the research werethirty students of seventh grade Academic Year 2012/2013 that consist of 15males and 15 females. The object of the research was how to raise thestudents’ motivation and learning activity by utilizing flash animation mediabased on the STAD theory. The result reveals that: (1) there is an averagerise of the students’ learning completeness which is indicated by (a) the test result in the first stage completes 63.33%, (b) the test-result in the secondstage completes 86.70% and the index gain is 0.32% which raises mediumcriteria. (2) Students learning activity is found rose which is indicated by theincreasing average percentage of 72.40 in the first stage becomes 88.48 inthe second stage. (3) There is an increasing number of students learningmotivation which is known that students’ motivation in the attentioncondition rises as much as 28.44% from 52.89% in the first stage becomes81.33% in the second stage, there is an increasing number in the relevancecondition as much as 23.67% from 64.75% in the first stage becomes88.42% in the second stage, there is an increasing number in the confidencecondition as much as 30.86% from 57.71% in the first stage become 88.57%in the second stage, on the satisfaction condition; there is also increasingnumber as much as 23.58% from 65.33% in the first stage becomes 88.92%in the second stage.

scholarly journals Precise description of single and double ionization of hydrogen molecule in intense laser pulses

2012 ◽  
Vol 137 (4) ◽  
pp. 044112 ◽  
Author(s):  
Mohsen Vafaee ◽  
Firoozeh Sami ◽  
Babak Shokri ◽  
Behnaz Buzari ◽  
Hassan Sabzyan
Keyword(s):  
Hydrogen Molecule ◽  
Laser Pulses ◽  
Double Ionization ◽  
Intense Laser ◽  
Precise Description ◽  
Intense Laser Pulses

Using the Multi-Parameter Fracture Mechanics for more Accurate Description of Stress/Displacement Crack Tip Fields

2013 ◽  
Vol 586 ◽  
pp. 237-240 ◽  
Author(s):  
Lucie Šestáková
Keyword(s):  
Stress Distribution ◽  
Fracture Mechanics ◽  
Boundary Conditions ◽  
Displacement Field ◽  
Singular Term ◽  
Crack Tip ◽  
Higher Order ◽  
Precise Description ◽  
Accurate Knowledge ◽  
Higher Order Terms

Most of fracture analyses often require an accurate knowledge of the stress/displacement field over the investigated body. However, this can be sometimes problematic when only one (singular) term of the Williams expansion is considered. Therefore, also other terms should be taken into account. Such an approach, referred to as multi-parameter fracture mechanics is used and investigated in this paper. Its importance for short/long cracks and the influence of different boundary conditions are studied. It has been found out that higher-order terms of the Williams expansion can contribute to more precise description of the stress distribution near the crack tip especially for long cracks. Unfortunately, the dependences obtained from the analyses presented are not unambiguous and it cannot be strictly derived how many of the higher-order terms are sufficient.

scholarly journals Four Distances between Pairs of Amino Acids Provide a Precise Description of their Interaction

2009 ◽  
Vol 5 (8) ◽  
pp. e1000470 ◽  
Author(s):  
Mati Cohen ◽  
Vladimir Potapov ◽  
Gideon Schreiber
Keyword(s):  
Amino Acids ◽  
Precise Description

Generalized Amalgams, With Applications to Fourier Transform

1990 ◽  
Vol 42 (3) ◽  
pp. 395-409 ◽  
Author(s):  
Hans G. Feichtinger
Keyword(s):  
Locally Compact Abelian Group ◽  
Global Behavior ◽  
Local Behavior ◽  
Precise Description ◽  
Locally Compact ◽  
Local Norm ◽  
Survey Article ◽  
Type Spaces ◽  
Wiener Type ◽  
Arbitrary Norms

A recent survey article by J. Fournier and J. Stewart (Bull.AMS 13 (1985), 1-21) explains how amalgams of Lp with lq (as function spaces over any locally compact abelian group G) can be used as an effective tool for the treatment of various problems in harmonic analysis. The present article may be seen as a complement to this survey, indicating further advantages that arise if one works with generalized amalgams (introduced in 1980 under the name of Wiener-type spaces by the author [10]). The main difference between amalgams and these more general spaces is the fact that they allow a more precise description of the local behavior of functions (or distributions) by rather arbitrary norms and that the conditions on the global behavior (of the quantity obtained using that chosen local norm) is described in a way that includes both growth and integrability conditions (not only lq-summability).

scholarly journals NILAI-NILAI KEARIFAN EKOLOGIS MASYARAKAT ADAT KRUI SEBAGAI ALTERNATIF SUMBER BELAJAR IPS SD-SMP DI PESISIR BARAT LAMPUNG

2016 ◽  
Vol 8 (2) ◽  
pp. 173-186
Author(s):  
Novia Fitri Istiawati
Keyword(s):  
Social Sciences ◽  
Self Reliance ◽  
The Law ◽  
Science Subject

 This study aims to (1) see history and characteristics of local indigeneous ecologies of Kui traditonal community, (2) obtain values of local genius on ecology that is possible to integrate into social sciences subject, and (3) model of local indigeneous ecologies of Krui tradional community as alternatives of learning sources of cocial science subject.  The study used ethnography applied in qualitatuve approach.  The study revealed: (1) Krui traditional community has their own local indigeneous ecologies to utilize and sustain forest, (2) values of local indigenius ecologies include: sustaining environment, cooperation work, adherence to the law, simple and self-reliance, democracy, work hard, sustainable and honest; (3) values of local genius in ecolocy are applicable to integrate in the learning sources of social sciences of grade: IV, V, and VI of SD levels and garde VII and VIII of SMP levels.    

scholarly journals Mecca Almukaramah at the beginning of the seventh century AH (13 AD) through Ibn Almugawer's journey (Clairvoyant's History)

2018 ◽  
Vol 26 (3) ◽  
pp. 77-97
Author(s):  
Nawaf Abdul Aziz Al-Jahmah Nawaf Abdul Aziz Al-Jahmah
Keyword(s):  
Point Of View ◽  
Seventh Century ◽  
Geographical Information ◽  
Precise Description ◽  
Historical Material ◽  
History Of ◽  
Accurate Observation

In the two years (625-626 AH) (1227-1228 AD), Ibn Almugawer gave a precise description of Mecca Almukaramah in his era, pointing to the importance of Mecca Almukaramah and its religious rank. The material presented by him is of great importance because it filled a gap in the traveling and geographical information of Mecca Almukaramah at the beginning of the seventh century AH (13 AD), especially since Ibn Almugawer was not just a chatty and a historian, but also a traveler with accurate observation. In view of the importance of the book from the scientific and historical point of view, we have decided to re-consult it, especially to its most documented editions (Oscar Lofgren Verification), to explore its material about Makkah Almukaramah and to vet some of its details and references that reflect an important phase in the history of Mecca Almukaramah, for the paucity of the writing about and the disturbance of the available historical material around it.

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